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Responses at the six levels to LED flashes (1 ms, n = 25) delivered to the dark- and light-adapted retina. As the ambient luminance rises, the b-wave declines in amplitude and changes its waveshape; the chiasm and corresponding cortical waveshapes decline somewhat in amplitude but retain the typical triphasic waveshape throughout. Each trace here and in Fig. 4 shows the mean ± SD (Rat J30).
